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  1. Article ; Online: Slow dynamics and nonergodicity of the bosonic quantum East model in the semiclassical limit.

    Geißler, Andreas / Garrahan, Juan P

    Physical review. E

    2023  Volume 108, Issue 3-1, Page(s) 34207

    Abstract: We study the unitary dynamics of the bosonic quantum East model, a kinetically constrained lattice model which generalizes the quantum East model to arbitrary occupation per site. We consider the semiclassical limit of large (but finite) site occupancy ... ...

    Abstract We study the unitary dynamics of the bosonic quantum East model, a kinetically constrained lattice model which generalizes the quantum East model to arbitrary occupation per site. We consider the semiclassical limit of large (but finite) site occupancy so that the dynamics is approximated by an evolution equation of the Gross-Pitaevskii kind. This allows us to numerically study in detail system sizes of hundreds of sites. Like in the spin-1/2 case, we find two dynamical phases, an active one of fast thermalization and an inactive one of slow relaxation and the absence of ergodicity on numerically accessible timescales. The location of this apparent ergodic to nonergodic transition coincides with the localization transition of the ground state. We further characterize states which are nonergodic on all timescales in the otherwise ergodic regime.
    Language English
    Publishing date 2023-09-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.034207
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  2. Article ; Online: Biomimetic Dehydrogenation of Non-Conventional Lignin Monomers on Cellulose Ferulate Interfaces.

    Elschner, Thomas / Geissler, Andreas / Adam, Jörg / Joseph, Yvonne / Fischer, Steffen

    Macromolecular bioscience

    2024  , Page(s) e2300556

    Abstract: Cellulose ferulate, synthesized by Mitsunobu reaction, is shaped into thin films and also used as an aqueous dispersion to perform artificial lignin polymerization on anchor groups. This biomimetic approach is carried out in a Quartz crystal microbalance ...

    Abstract Cellulose ferulate, synthesized by Mitsunobu reaction, is shaped into thin films and also used as an aqueous dispersion to perform artificial lignin polymerization on anchor groups. This biomimetic approach is carried out in a Quartz crystal microbalance with a dissipation monitoring (QCM-D) device to enable online monitoring of the dehydrogenation, applying H
    Language English
    Publishing date 2024-03-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2039130-4
    ISSN 1616-5195 ; 1616-5187
    ISSN (online) 1616-5195
    ISSN 1616-5187
    DOI 10.1002/mabi.202300556
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  3. Book ; Online ; Thesis: Untersuchung des Reaktionsverhaltens von Reinbrennstoffen und Brennstoffmischungen bei der Flugstromvergasung

    Geißler, Andreas [Verfasser]

    2020  

    Author's details Andreas Geißler
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language German
    Publisher Verlag Dr. Hut
    Publishing place München
    Document type Book ; Online ; Thesis
    ISBN 978-3-8439-4507-3 ; 3-8439-4507-1
    Database Digital theses on the web

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  4. Article ; Online: A Solvent-Free Approach to Crosslinked Hydrophobic Polymeric Coatings on Paper Using Vegetable Oil.

    Loesch-Zhang, Amelia / Cordt, Cynthia / Geissler, Andreas / Biesalski, Markus

    Polymers

    2022  Volume 14, Issue 9

    Abstract: Hydrophobic coatings are of utmost importance for many applications of paper-based materials. However, to date, most coating methods demand vast amounts of chemicals and solvents. Frequently, fossil-based coating materials are being used and multiple ... ...

    Abstract Hydrophobic coatings are of utmost importance for many applications of paper-based materials. However, to date, most coating methods demand vast amounts of chemicals and solvents. Frequently, fossil-based coating materials are being used and multiple derivatization reactions are often required to obtain desired performances. In this work, we present a solvent-free paper-coating process, where olive oil as the main biogenic component is being used to obtain a hydrophobic barrier on paper. UV-induced thiol-ene photocrosslinking of olive oil was pursued in a solvent-free state at a wavelength of 254 nm without addition of photoinitiator. Optimum reaction conditions were determined in advance using oleic acid as a model compound. Paper coatings based on olive oil crosslinked by thiol-ene reaction reach water contact angles of up to 120°. By means of Fourier transform infrared spectroscopy and differential scanning calorimetry, a successful reaction and the formation of a polymer network within the coating can be proven. These results show that click-chemistry strategies can be used to achieve hydrophobic polymeric paper coatings while keeping the amount of non-biobased chemicals and reaction steps at a minimum.
    Language English
    Publishing date 2022-04-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym14091773
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  5. Article ; Online: Hydrophobic glass and paper coatings based on plasma polymerized vegetable oils using a novel atmospheric pressure plasma concept

    Bellmann, Martin / Loesch‐Zhang, Amelia / Möck, Dennis M.J. / Appelt, Jörn / Geissler, Andreas / Viöl, Wolfgang

    2024  

    Abstract: Atmospheric pressure plasma polymerization represents a promising coating technology, addressing drawbacks of traditional processes (solvent use, multistep procedures, etc.) while enabling deposition of thin cross‐linked polymer layers with high contour ... ...

    Abstract Atmospheric pressure plasma polymerization represents a promising coating technology, addressing drawbacks of traditional processes (solvent use, multistep procedures, etc.) while enabling deposition of thin cross‐linked polymer layers with high contour fidelity. We address technological challenges with a novel plasma device that integrates multiple plasma source benefits and investigate the suitability of two plant‐based precursors, chia and tung oil, for plasma polymerization to hydrophobize glass and paper. Chia oil enables the deposition of thin, covalently bonded hydrophobic polymer layers. Such coatings have diverse applications especially inside the paper industry, where water repellents in the form of internal and surface sizing have always been an essential functionalization step. Using bio‐based precursors and reducing extra chemicals contributes to substituting fossil‐based or harmful substances.

    Online First
    Keywords coating ; jet‐induced sliding discharge ; paper ; plasma‐enhanced chemical vapor deposition (PECVD) ; vegetable oil
    Subject code 660
    Language English
    Publishing date 2024-02-20
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Entrapment of Hydrophobic Biocides into Cellulose Acetate Nanoparticles by Nanoprecipitation.

    Cordt, Cynthia / Meckel, Tobias / Geissler, Andreas / Biesalski, Markus

    Nanomaterials (Basel, Switzerland)

    2020  Volume 10, Issue 12

    Abstract: This contribution reports an efficient method for the production and use of biocide-loaded cellulose acetate nanoparticles. As well-known model biocides 4-Hexylresorcinol and Triclosan were used for in situ nanoparticle loading during a nanoprecipitation ...

    Abstract This contribution reports an efficient method for the production and use of biocide-loaded cellulose acetate nanoparticles. As well-known model biocides 4-Hexylresorcinol and Triclosan were used for in situ nanoparticle loading during a nanoprecipitation process. We show that the nanoparticle size can be well-controlled by variation of the cellulose acetate concentration during nanoprecipitation. Apart from strong evidence suggesting cellulose acetate particle formation according to a nucleation-aggregation mechanism, we further show that the biocide loading of the particles occurs by a diffusion process and not via co-precipitation. The quantity of particle loading was analyzed by
    Language English
    Publishing date 2020-12-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano10122447
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  7. Book ; Thesis: Klinische Aspekte bei der Verwendung von Ventilprothesen

    Geissler, Andreas

    1985  

    Size 25 S. : Ill., graph. Darst.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Würzburg, Univ., Diss., 1985
    HBZ-ID HT002527623
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    85 D 2440 order for loan Magazin

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  8. Article ; Online: Biobased hydrophobic glass and paper coatings obtained via plasma polymerization using a novel jet-induced sliding discharge method

    Loesch-Zhang, Amelia / Bellmann, Martin / Möck, Dennis M. J. / Appelt, Jörn / Geissler, Andreas

    2023  

    Keywords Text ; abstract_or_summary ; ddc:670 ; coating -- paper -- plasma polymerization -- vegetable oil
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Fate of a biodegradable plastic in forest soil: Dominant tree species and forest types drive changes in microbial community assembly, influence the composition of plastisphere, and affect poly(butylene succinate-co-adipate) degradation

    Tanunchai, Benjawan / Li, Ji / Schröder, Olaf / Gawol, Susanne Julia / Geissler, Andreas / Wahdan, Sara Fareed Mohamed / Buscot, François / Kalkhof, Stefan / Schulze, Ernst-Detlef / Noll, Matthias / Purahong, Witoon

    Science of the Total Environment. 2023 May, v. 873 p.162230-

    2023  

    Abstract: Poly(butylene succinate-co-adipate) (PBSA) degradation and its plastisphere microbiome in cropland soils have been studied; however, such knowledge is limited in the case of forest ecosystems. In this context, we investigated: i) the impact of forest ... ...

    Abstract Poly(butylene succinate-co-adipate) (PBSA) degradation and its plastisphere microbiome in cropland soils have been studied; however, such knowledge is limited in the case of forest ecosystems. In this context, we investigated: i) the impact of forest types (conifer and broadleaved forests) on the plastisphere microbiome and its community assembly, ii) their link to PBSA degradation, and iii) the identities of potential microbial keystone taxa. We determined that forest type significantly affected microbial richness (F = 5.26–9.88, P = 0.034 to 0.006) and fungal community composition (R² = 0.38, P = 0.001) of the plastisphere microbiome, whereas its effects on microbial abundance and bacterial community composition were not significant. The bacterial community was governed by stochastic processes (mainly homogenizing dispersal), whereas the fungal community was driven by both stochastic and deterministic processes (drift and homogeneous selection). The highest molar mass loss was found for PBSA degraded under Pinus sylvestris (26.6 ± 2.6 to 33.9 ± 1.8 % (mean ± SE) at 200 and 400 days, respectively), and the lowest molar mass loss was found under Picea abies (12.0 ± 1.6 to 16.0 ± 0.5 % (mean ± SE) at 200 and 400 days, respectively). Important fungal PBSA decomposers (Tetracladium) and atmospheric dinitrogen (N₂)-fixing bacteria (symbiotic: Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium and Methylobacterium and non-symbiotic: Mycobacterium) were identified as potential keystone taxa. The present study is among the first to determine the plastisphere microbiome and its community assembly processes associated with PBSA in forest ecosystems. We detected consistent biological patterns in the forest and cropland ecosystems, indicating a potential mechanistic interaction between N₂-fixing bacteria and Tetracladium during PBSA biodegradation.
    Keywords Methylobacterium ; Mycobacterium ; Picea abies ; Pinus sylvestris ; bacterial communities ; biodegradability ; biodegradation ; community structure ; conifers ; cropland ; environment ; forest soils ; forest types ; fungal communities ; fungi ; microbiome ; molecular weight ; nitrogen ; plastics ; trees ; Plastisphere microbiome ; Homogenizing dispersal ; Ecological drift ; Homogeneous selection ; Atmospheric dinitrogen fixing bacteria ; Microbial keystone taxa
    Language English
    Dates of publication 2023-05
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.162230
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 74/341: Show issues

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  10. Article ; Online: Exploring the potential of comparative de novo transcriptomics to classify Saccharomyces brewing yeasts.

    Behr, Jürgen / Kliche, Meike / Geißler, Andreas / Vogel, Rudi F

    PloS one

    2020  Volume 15, Issue 9, Page(s) e0238924

    Abstract: In this work the potential of comparative transcriptomics was explored of Saccharomyces (S.) cerevisiae and S. pastorianus for their discrimination. This way an alternative should be demonstrated to comparative genomics, which can be difficult as a ... ...

    Abstract In this work the potential of comparative transcriptomics was explored of Saccharomyces (S.) cerevisiae and S. pastorianus for their discrimination. This way an alternative should be demonstrated to comparative genomics, which can be difficult as a result of their aneuoploid genomes composed of mosaics of the parental genomes. Strains were selected according to their application in beer brewing, i.e. top and bottom fermenting yeasts. Comparative transcriptomics was performed for four strains each of commercially available S. cerevisiae (top fermenting) and Saccharomyces pastorianus (bottom fermenting) brewing yeasts grown at two different temperatures to mid-exponential growth phase. A non-reference based approach was chosen in the form of alignment against a de novo assembled brewery-associated pan transcriptome to exclude bias introduced by manual selection of reference genomes. The result is an analysis workflow for self-contained comparative transcriptomics of Saccharomyces yeasts including, but not limited to, the analysis of core and accessory gene expression, functional analysis and metabolic classification. The functionality of this workflow is demonstrated along the principal differentiation of accessory transcriptomes of S. cerevisiae versus S. pastorianus strains. Hence, this work provides a concept enabling studies under different brewing conditions.
    MeSH term(s) Beer/microbiology ; Computational Biology/methods ; Computer Simulation ; Fermentation ; Fungal Proteins/genetics ; Gene Expression Profiling/methods ; Gene Expression Regulation, Fungal ; Saccharomyces/classification ; Saccharomyces/genetics ; Saccharomyces/growth & development ; Saccharomyces cerevisiae/growth & development ; Saccharomyces cerevisiae/isolation & purification ; Saccharomyces cerevisiae Proteins/genetics ; Workflow
    Chemical Substances Fungal Proteins ; Saccharomyces cerevisiae Proteins
    Language English
    Publishing date 2020-09-23
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0238924
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